Across:2. | They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen, from which simple salts can be made. | 4. | next reactive metals, found in earths crust but not in elemental form. Its elements are calcium, strontium, magnesium, barium ,beryllium and radium. | 8. | any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table. | 10. | The f-block of the periodic table. | 11. | The d-block of the periodic table. |
| | Down:1. | any of certain common metals such as copper, lead, zinc, and tin, as distinct from the precious metals, gold, silver, and platinum | 3. | They are all radioactive, the heavier members being extremely unstable and not of natural occurrence. | 5. | any of the elements lithium, potassium, francium, etc, occupying Group IA (1) of the periodic table, also are very reactive, electropositive, monovalent metals. | 6. | An element possessing metallic properties in an inferior degree and not malleable, as arsenic, antimony, bismuth, molybdenum, uranium, etc. | 7. | any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 18 of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known. | 9. | usually gain electrons easily, poor conductors of heat and electricity | 12. | belonging to the elements with atomic numbers greater than 103 |
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